What exactly is the difference between a surge protector and a fuse? Can a fuse protect the electronic devices from lightning instead of surge protector?

He then describes Rainy Season and Lightning.

but I think this circuit , shows a few more pieces.

These are simplified answers to the original question, and does not change anything I wrote above.

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An AC voltage/ current source, and an ac inductive load.

2024–10–10[John johnson John Johnson ]

OK, this is Mohan Rajaratnam’s definition of a Surge suppressor.

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This device then solves the entire problem.

[old diagram got deleted by accident]

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But during the surge, the fuse will not blow if it is a longer duration and lower value )10 to 50%).

A fuse is a non-resetable over current circuit protector.

This is an electronic circuit designed to clamp voltages so that the Voltage Potential that appears at the outlet is never going to exceed the nominal value.

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so, the loop of wire then, when put together with another loop reduces the ‘noise’ on a power line.

At least they know the answer if they wanted it.

“ A fuse is a device which protects the (circuit) against overload and short circuit.”

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But it can get overloaded, and no longer works.

This one hit behind the barn.

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What does a fuse do?

2024–10–11 [Bobby Sanchez Bobby Sanchez ].

It seems Mohan does not understand the difference between a comment and an Answer.

Hello, I have a question about astral projection. I started to get interested in this a little while after my mum passed in april. I thought I may be able to see her and speak with her if I managed to achieve astral projection. Since this interest, every time i sleep on my back I go into sleep paralysis. However, I cant progress into astral projection because it is very scary for me as I feel like I'm suffocating when this happens. I panic and force myself to wake up. This only ever happened about once a year before this. It sometimes lasts a long time. This has happened about 3 times per week since my mum died, as mentioned on a previous post. I no longer try to go into it anymore(due to the suffocating feeling), but it still happens. I read that sleep paralysis is the pathway to astral projection. Why has this started to happen so frequently since simply taking an interest in it? Is this connected to the afterlife? I am concerned about it as I now cannot seem to stop this happening. Could it be my mum trying to communicate? Im asking due to more knowledge around this in this group.

First Sentence:

The bolt then partially travels down the line to your home.

but this device (an Inductor) … impedes the rapid changes in the current.

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If the nominal power is 4,000 watts then the current at 230volts is 16 amps.

For this case there are devices called Metal oxide varistors (MOV).

Can the fuse protect the electronic devices from lightning instead of a surge protector.

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P = e* I, so since I is 16 amps, then the voltage dropped is 1/16 volt or 0.0650 volts.

Is the question then , "why buy a surge supressor, if the fuse alone protects the electronic circuits from a lightning bolt?".

what exactly is a ‘surge’ protector?

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a photo is worth a thousand words.

The other is “what does a “fuse” do?”

I post the exact comment here.

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So, the voltage could go up to 500 volts, and the fuse will not open up.

He then asserts :

The MOV will conduct when the voltage exceeds 50% of line voltage.

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Mohan forgets that a fuse is a one-time device, and needs to be replaced if it is tripped.

the problem then depends on "how fast does the fuse operate?".

Upvotes:

eight

It also is a device that limits the change in current flow.

Once the voltage goes over 0.0650 volts, then this fact can be used to amplify the difference, and turn the circuit breaker off , furthur down the line. Essentially that is what a RCD/GFCI does, it compares the incoming current, to the outgoing current, and if the difference between the two currents is over 5mA, then it trips the circuit breaker.

(Dc diagram shown, AC is similar).

There are three different concepts here that are getting confused.

2024–09–27 [ Mohan Rajaratnam Mohan Rajaratnam ] . Thinks you can get free electricity from nothing : Mohan Rajaratnam's answer to Is it possible to generate free electricity at home using a magnet or other low-cost methods? If so, how does it work?

Here is a simplified AC power diagram.

This is the picture of an electronic coil of wire wound around a core of magnetic material.

The third is lightning and “how it gets conducted into a home.”

This is where this question deviates from being a 'generic' question, and becomes more specific.

A circuit breaker is similar, but is resettable.

What is lightning?

In schematic diagrams this is the symbol for a fuse:

There are two important concepts here.

2024–10–11 [Victor Olarewsju Victor Olarewaju ]

“ … to protect building, lightning arrestor, is provided above building and directly connected to earth.”

He then describes the function of a fuse.

[image of Common-mode choke]

This is a high voltage low current spike that comes down the line because of the power poles being struck, and the voltage suppressors activating on the primary side of the transformer.

These devices are installed between the “hot” and “neutral” and protective ground.

It’s been three xxx five werks, and there has been no response to my follow on query on his Commment to my answer.

This is where the MOV conducts again, and dissipated the energy.

One

Would individual surge supressors have save this equipment? most likely, since the surge supressor would take the jolt instead of the electronic components.

But… the neutral is now “floating” because of the 1 ohm resistance.

2024–10–00 [ Ammar Mahdi ] Ammar Mahdi

There is no harm in having the surge suppressor along with the fuse in the circuit. The fuse will not open up until the current melts the link. This will take time, and in the interim, that jolt will get transmitted into the power supplies.

Edit 2024–10.

This is a photo where a lightning bolt took out a home's complete mains distribution box, and a lot of electronic gear as well.

so, what happens?

Now when you have a certain ac resistance, then a current flows in a loop.

Because the load is inductive, the current lags the voltage.(by a bit).

When the current is 200% of the rated value , it will “go open” (the link metal melts) and protect the device.

One is “what exactly is in a ‘surge protector’ ? ”

(There is no concept of polarity, in the loop because the current changes direction 100 to 120 times a second (power frequency).

So, it’s possible that these devices from Trip Lite have addition suppression devices, these ones seem to be sturdy.

Lightning arrestor is a spark-gap device, and can be installed anywhere. What is important, is that the wire is thick enough to withstand the lightning bolt and conduct the energy away from the building.

And this is the problem alone. Is the power supply in the equipmemt designed with a lightning strike in mind? Some yes, others, no.

So combined with a device called a MOV or Metal-oxide-resistor, then forms the 3rd part of a “surge suppressor “.

Fuses, on their own, then operate much slower than the MOV variable resistance, during the lightning strike.

At the secondary, it is 1000 times less.)turns ratio). If it gets hit with a 100,000 volt bolt of lightning then the voltage arrestors conduct and clamp the voltage down to line voltage, ( but a small amount leaks down the line). This is the problem.

At one ohm, the resistor has a maximum of 1 watt power.

“ A surge suppressor is the one which is connected at the input supply so that when there is a sudden change voltage it bypasses thereby protecting the (circuit) and electronic components”

This is 'the assistant's answer'

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2024–10–14 [Omar Gharbi Omar Gharbi ]